Www.oasys-software.com GSA 8.6 – New Features. GSA 8.6 – New Features.
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Transcript of Www.oasys-software.com GSA 8.6 – New Features. GSA 8.6 – New Features.
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GSA 8.6 – New Features
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GSA 8.6 – New Features
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64-bit edition
GSA 8.6 – New Features
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GSA 8.6 – 64-bit hardware support
• New 64-bit edition of GSA• 32-bit edition remains available
• Improved handling of large models
• Utilises (effectively) unlimited RAM• 264 = 18,446,744,073,709,551,616• (232 = 4,294,967,296)
• Side effects• OpenGL viewports• Graphics selection• (resolved by updating graphics driver in most cases)
• Licensing
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Steel Design
GSA 8.6 – New Features
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GSA 8.6 – Steel Design Codes
New steel design codes:
• AISC360:05
• AISC360:10
• AS4100:98
• HKSUOS:05
• EN 1993-1-1:2005 Eurocode 3 (NL)
• EN 1993-1-1:2005 Eurocode 3 (FR)
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GSA 8.6 – Steel Design of Channels and Tees
• Steel design may now be carried out for Channel and Tee sections
• This is available for all supported codes
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Seismic Analysis
GSA 8.6 – New Features
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GSA 8.6 – Seismic codes
• Response spectra supported now include:• ASCE 7-10 (USA)• GB50011-2010 (China)
• Equivalent static analysis extended to more support more codes:• ASCE 7, Eurocode 8, FEMA 356, GB50011, IBC, IS 1893,
UBC 97
• Response spectrum analysis now has a fast or rigorous option• Fast – only combines responses where coupling
coefficient is significant – reducing the number of calculations when there are a large number of modes
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2D Load Panel Elements
GSA 8.6 – New Features
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GSA 8.6 – 2D Load Panel Elements
• Non-structural 2D elements that transfer load to surrounding beam elements
• Load distribution options:• All edges supported• Three edges supported• Two edges supported• Two adjacent edges supported• One edge supported• Cantilever support
• Useful for applying wind loads
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GSA 8.6 – 2D Load Panel Elements
• Limitations• Will give force equilibrium...
... but may not give moment equilibrium (one edge supported)• Can only be used for uniform pressure over the element• Load panel must be bounded by beam (bar) elements
(can be dummy elements)• Dummy elements cannot be loaded – different load
pattern must be selected• Can be problems if warped
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GSA 8.6 – Cladding tool
• Generates load panel elements
• Convenient for ‘cladding’ a structure for the application of wind loads
• Can be caught out by complex topologies
• (Implemented to contribute to the GsWind ‘Wind loading Automation for GSA’ development, funded by others)
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GSA 8.6 – Cladding tool
• Start with frame model
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GSA 8.6 – Cladding tool
• Start with frame model
• Create list of exterior elements & select
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GSA 8.6 – Cladding tool
• Start with frame model
• Create list of exterior elements & select
• Use ‘Create Load Panels on Surface’
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GSA 8.6 – Cladding tool
• Start with frame model
• Create list of exterior elements & select
• Use ‘Create Load Panels on Surface’
• Add cladding to model
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GSA 8.6 – Cladding tool
• Start with frame model
• Create list of exterior elements & select
• Use ‘Create Load Panels on Surface’
• Add cladding to model
• Clad model
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2D Element Thickness Modifiers
GSA 8.6 – New Features
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GSA 8.6 – Thickness Modifiers on 2D Elements
• New modifier for mass/weight calculations• Includes gravity loading
• Clarification of thickness used for 2D element results• In-plane forces (Nx, Ny, Nxy) based on in-plane thickness
• Moments (Mx, My, Mxy) based on bending thickness
• Through thickness shear (Qx, Qy) based on bending thickness• Stresses (σxx, σyy, σzz, σxy, σyz, σzx) based on actual
thickness
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Wall Element
GSA 8.6 – New Features
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GSA 8.6 – Wall Element
• Super-elements represented internally by 4-by-4 Quad8 shell elements.
• Wall results are represented on an equivalent beam, or ‘wall stick’, in either direction
• Equivalent beam results can be tabulated, and displayed as contours and diagrams • Forces/moments & stresses
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GSA 8.6 – Wall Element
• A large 2D element/super-element represented internally by 4×4 Quad8 shell elements
• Wall results are represented on an equivalent beam or ‘wall stick’ in either primary or secondary direction, i.e. wall elements results at the 4 edges
• Wall element nodes have rotational stiffness about the normal direction of the wall elements• But with limitations
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GSA 8.6 – Wall Element
Topology 1 Topology 2
Topology 4 Topology 3
A wall element
Edge 1
Edge 2
Edge 3
Edge 4
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GSA 8.6 – Wall Element
Topology 1 Topology 2
Topology 4 Topology 3
Equivalent beams in results output
Primary
Sec
on
dar
y
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GSA 8.6 – Wall Element
Topo 1 Topo 2
Topo 4 Topo 3
Generation of drilling stiffness
Edge 1
Edge 2
Edge 3
Edge 4
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GSA 8.6 – Wall Element
Generation of drilling stiffness
Dummy/slave node to the edge nodes
Same vertical displacement
Same horizontal displacement
Stiff beam with in-plane bending & shear stiffness only, pinned at dummy node end and fixed at corner node end
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GSA 8.6 – Wall Element
• Known limitations in this version of GSA• Wall element must be rectangular• Wall elements can only be used for linear static, modal
dynamic and response spectrum analysis• Grouped wall element results are not available• Cut section forces are not available• Other elements can only connected to the wall elements
through the 4 nodes• Only equivalent beam results (wall edge results) are
available, it is not appropriate to use wall to model slab at the moment• Drilling stiffness is underestimated if the connected beam
section size is larger than 1/8 of the wall element size
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2D Elements with ‘zz’ Stiffness
GSA 8.6 – New Features
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GSA 8.6 – 2D Linear Element with ‘zz’ Rotational Stiffness
• ‘Drilling’ degree of freedom• Bilinear: x, y, z, xx, yy• Allman-Cook: x, y, z, xx, yy, zz
• Useful because:• Practically Avoids use of automatic constraints
• Numerically Reduces in-plane shear locking - better approximations
• Caution because:
Not reliable for connecting beam elementsdirectly through a single point connection
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GSA 8.6 – 2D Linear Element with ‘zz’ Rotational Stiffness
Example
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Torsion Constant for Perimeter Sections
GSA 8.6 – New Features
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GSA 8.6 – Torsion Constant ‘J’ for Perimeter Sections
• Works (almost) like any other section property• Calculated in the Section Wizard
• Uses a new solver based on BEM
• Restricted to thick-walled sections only• Warning if walls are
too thin
• To be extended to thin-walled sections in the future
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GSA 8.6 – Torsion Constant ‘J’ for Perimeter Sections
BEM solution
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Solvers
GSA 8.6 – New Features
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GSA 8.6 – GSS Improvements
• Parallel sparse direct solver • New linear analysis solution method• Exploits multi-cores• Significantly speeds up the stiffness matrix factorisation • (But only marginal reduction in overall analysis time)
• New eigensolver• Uses shifting & locking to improve convergence• Up to 10× faster
• New solution option – Model Stability• Analysis of the stiffness of the structure• Identify unrestrained or overly flexible parts of the
structure
• Other improvements• Improved stiffness matrix assembly
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GSA 8.6 – GSS Improvements
• Condition number estimation• The condition number indicates maximum possible error
in the displacements while solving a linear system• A high condition number can imply results cannot be
trusted• A model with condition number > 1016 is almost singular• Cause of high condition numbers can be investigated
using the Model Stability analysis
• High condition numbers if• Model is unrestrained• Part of the model is unrestrained• Part of the model is too flexible
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GSA 8.6 – Batch Analysis Auto-save
• When ‘Tools | Preferences | Miscellaneous | Save file after batch analysis’ is set, and
• ‘Analysis | Batch Analysis’ is set,
• The file is saved automatically following a successful analysis
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GSA COM
GSA 8.6 – New Features
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GSA 8.6 – COM interface enhancements
• GwaCommand ‘GET_ALL’ returns whole module
• Output_Arr function returns array of results
• New view functions to manipulate saved views
• EntitiesInList returns array of entities in list
• NodeConnectedEnt returns array of entities connected at a node
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2D Element Centre Only Results
GSA 8.6 – New Features
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GSA 8.6 – Results at 2D Element Centres Only
• Option to calculate results at element centres only• To reduce file size• and memory
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GSA 8.6 – Results at 2D Element Centres Only
• Options to display results at element centres only• To reduce post-processing, especially in RC slab design• Whether or not results are stored at nodal positions
• Contours and diagrams
• Element user module ‘CENTRE_ONLY_2D’ flag
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Miscellaneous
GSA 8.6 – New Features
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GSA 8.6 – File I/O and Non-numeric Values
• GSA checks for valid numerical values when reading the file
• Invalid numerical values in tables are dispalyed as #### (previously -1 until editing field)
• Preference to check file versions when reading – gives warning of file written by a different version of GSA and therefore possible compatibility issues.
• Save is disabled after saving until model is modified.
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GSA 8.6 – Incomplete Entities
• Option in Elements/Member tables to identify incomplete entities• Red – reference to non-existant entitiy• Blue – repeated entity
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GSA 8.6 – Edge load on 2D Elements
• Edge loads can now be applied as• A pressure on the edge (original option)• A force per unit length
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GSA 8.6 – Constraint Stage Lists
• Constraints may now be specified as applying to a list of stages
• Generalised restraints, rigid constraints, joints, constraints and tied interfaces
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GSA 8.6 – Load Names
• Names may now be given to loading records• Only visible in load tables if the 'Input | Show names in
loads tables' preference is selected
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GSA 8.6 – Spreadsheet Interaction
• ‘Fully populate fields’ Output Setting
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GSA 8.6 – Spreadsheet Interaction
• ‘Fully populate fields’ Output Setting• Useful when used with Excel 'Filter' and 'PivotTable'
features
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GSA 8.6 – Misc. Output Options
• Beam Section Extended Properties:
• Grid plane areas reported in Grid Planes output
• Case list now recognised in:• Mass Details; Dynamic Details; Dynamic Summary;
Buckling Details; Response Spectrum Details
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GSA 8.6 – Graphic View Selection Options
• Option to select all elements with same property or group or material
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GSA 8.6 – Graphic View Selection Options
• Option to select all elements with same property or group or material
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GSA 8.6 – Sculpt – Split At Plane
• Sculpt option to split 1D entities at intersection with plane
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GSA 8.6 – Sculpt – Split At Plane
• Sculpt option to split 1D entities at intersection with plane
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GSA 8.6 – Sculpt – Split At Plane
• Sculpt option to split 1D entities at intersection with plane
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GSA 8.6 – Sculpt – Align Elements
• Sculpt element alignment options to:• ‘Align 1D Elements’ – selected 1D elements are flipped
such that the element x axes point generally in current grid axis directions• ‘Align 2D Element Edges’ – selected 2D elements are
spun such that the first edges align generally with specified axes• ‘Align 2D Element Z Axes ’ – selected 2D elements are
flipped such that the element z axes point generally in current grid axis directions
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GSA 8.6 – Sculpt – Connect Column to Slab
• Sculpt option to connect columns to slabs
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GSA 8.6 – Sculpt – Connect Column to Slab
• Sculpt option to connect columns to slabs• Uses rigid constraints• To transfer rotational stiffness
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Interface with Third Party Software
GSA 8.6 – New Features
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GSA 8.6 – Interface with BIM
• The GSA Revit link works with Revit Structure 2012
• ... and Revit Structure 2013